lisa.trace: Make Trace._swap_size_overhead work with older versions o… (!1338) · Merge requests · Tooling / lisa · GitLab

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Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_pr512 into master Feb 18, 2020

…f pandas/pyarrow

Old versions pandas and/or pyarrow cannot serialize dataframes with 0 columns, so avoid triggering that in _swap_size_overhead.